from flask import render_template, current_app, session, g, abort, request, jsonify

from info import constants, db
from info.models import News, User, Comment, CommentLike
from info.utils.common import user_login_data
from info.utils.response_code import RET
from . import news_blue


@news_blue.route("/<int:news_id>")
@user_login_data
def news_detail(news_id):
    """新闻详情
    :param news_id:
    :return:
    """
    user = g.user
    # 右侧新闻排行数据
    # 1. 去数据库查询数据
    news_list = []
    try:
        news_list = News.query.order_by(News.clicks.desc()).limit(constants.CLICK_RANK_MAX_NEWS)
    except Exception as e:
        current_app.logger.error(e)
    # 字典列表
    news_list_li = []
    # 遍历模型对象,将模型对象转换为字典添加到字典列表中
    for news in news_list:
        news_list_li.append(news.to_basic_dict())

    # 去数据库查询新闻信息
    news = None  # type:News
    try:
        news = News.query.get(news_id)
    except Exception as e:
        current_app.logger.error(e)
    # 如果新闻不存在,报404错误
    if not news:
        abort(404)
    # 更新新闻的点击次数
    news.clicks += 1
    # 判断是否收藏该新闻
    is_collected = False
    is_followed=False
    # 如果用户已登录
    if user:
        # collection_news后面可以不加all(),因为sqlalchemy会自动加载
        if news in user.collection_news:
            is_collected = True
    if user and news.user:
        if news.user.followers.filter(User.id==user.id).count():
            is_followed=True
    comments=[]
    try:
        comments=Comment.query.filter(Comment.news_id==news_id).order_by(Comment.create_time.desc()).all()
    except Exception as e:
        current_app.logger.error(e)
    comment_list=[]
    for comment in comments:
        comment_list.append(comment.to_dict())
    comment_like_ids=[]
    if user:
        comments=Comment.query.filter(Comment.news_id==news_id).all()
        comment_ids=[comment.id for comment in comments]
        commentlikes=CommentLike.query.filter(CommentLike.comment_id.in_(comment_ids),CommentLike.user_id==user.id).all()
        comment_like_ids=[commentlike.comment_id for commentlike in commentlikes]
    for comment in comment_list:
        comment["is_like"]=False
        if user and comment["id"] in comment_like_ids:
            comment["is_like"]=True

    data = {
        "user": user.to_dict() if user else None,
        "news_list_li": news_list_li,
        "news": news.to_dict(),
        "is_collected": is_collected,
        "comments":comment_list,
        "is_followed":is_followed

    }
    return render_template("news/detail.html", data=data)


@news_blue.route("/news_collect", methods=["POST"])
@user_login_data
def news_collect():
    """
    收藏与取消收藏
    :return:
    """
    user = g.user
    if not user:
        return jsonify(errno=RET.SESSIONERR, errmsg="用户未登陆")

    # 1. 接受参数
    params = request.json
    news_id = params.get("news_id")
    action = params.get("action")

    # 2. 校验参数
    if not all([news_id, action]):
        return jsonify(errno=RET.PARAMERR, errmsg="参数错误")
    if action not in ["cancel_collect", "collect"]:
        return jsonify(errno=RET.DBERR, errmsg="参数错误")
    try:
        news_id = int(news_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.PARAMERR, errmsg="参数错误")

    # 3. 查询新闻,判断新闻是否存在
    try:
        news = News.query.get(news_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.DBERR, errmsg="查询错误")
    if not news:
        return jsonify(errno=RET.NODATA, errmsg="未查询到数据")
    # 4. 收藏  取消收藏

    if action == "collect":
        # news没有在用户的收藏列表里,收藏新闻
        if news not in user.collection_news:
            user.collection_news.append(news)
    else:
        if news in user.collection_news:
            user.collection_news.remove(news)
    # 5. 返回响应
    try:
        db.session.commit()
    except Exception as e:
        current_app.logger.error(e)
        db.session.rollback()
        return jsonify(errno=RET.DBERR, errmsg="保存失败")
    return jsonify(errno=RET.OK, errmsg="操作成功")


@news_blue.route("/news_comment", methods=["POST"])
@user_login_data
def news_comment():
    """
    新闻评论
    :return:
    """
    user = g.user
    if not user:
        return jsonify(errno=RET.SESSIONERR, errmsg="用户未登录")
    # 1. 接受参数
    news_id = request.json.get("news_id")
    comment_content = request.json.get("comment")
    parent_id = request.json.get("parent_id")
    # 2. 校验参数
    if not all([news_id, comment_content]):
        return jsonify(errno=RET.PARAMERR, errmsg="参数错误")
    try:
        news_id = int(news_id)
        if parent_id:
            parent_id = int(parent_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.DATAERR, errmsg="数据错误")
    # 3. 查询新闻,判断新闻是否存在
    try:
        news = News.query.get(news_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.DBERR, errmsg="查询错误")
    if not news:
        return jsonify(errno=RET.NODATA, errmsg="未查询到数据")

    # 4. 初始化评论模型, 并且赋值
    comment = Comment()
    comment.user_id = user.id
    comment.news_id = news_id
    comment.content = comment_content
    if parent_id:
        comment.parent_id = parent_id
    # 5. 添加到数据库
    try:
        db.session.add(comment)
        # 需要手动commit(),因为在return的时候需要用到commit的id
        db.session.commit()
    except Exception as e:
        current_app.logger.error(e)
        db.session.rollback()
        jsonify(errno=RET.DBERR, errmsg="数据库插入失败")

    return jsonify(errno=RET.OK, errmsg="OK", data=comment.to_dict())

@news_blue.route("/comment_like",methods=["post"])
@user_login_data
def set_comment_like():
    if not g.user:
        return jsonify(errno=RET.SESSIONERR,errmsg="用户未登陆")
    data=request.json
    comment_id=data.get("comment_id")
    news_id=data.get("news_id")
    action=data.get("action")
    if not all([comment_id,news_id,action]):
        return jsonify(errno=RET.PARAMERR,errmsg="参数不全")
    try:
        comment_id=int(comment_id)
        news_id=int(news_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(RET.PARAMERR,errmsg="参数错误")
    if action not in ("add","remove"):
        return jsonify(RET.PARAMERR,errmsg="参数错误")
    news=None
    comment=None
    try:
        news=News.query.get(news_id)
        comment=Comment.query.get(comment_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.DBERR,errmsg="数据库查询错误")
    if not news:
        return jsonify(errno=RET.NODATA,errmsg="该新闻不存在")
    if not comment:
        return jsonify(errno=RET.NODATA,errmsg="该评论不存在")
    commentlike=None
    try:
        commentlike=CommentLike.query.filter(CommentLike.user_id==g.user.id,CommentLike.comment_id==comment_id).first()
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.DBERR,errmsg="数据库查询错误")
    if action=="add":
        if not commentlike:
            comment_like=CommentLike()
            comment_like.comment_id=comment_id
            comment_like.user_id=g.user.id
            db.session.add(comment_like)
            comment.like_count+=1
    else:
        if commentlike:
            db.session.delete(commentlike)
            comment.like_count-=1
    try:
        db.session.commit()
    except Exception as e:
        db.session.rollback()
        current_app.logger.error(e)
        return jsonify(errno=RET.DBERR,errmsg="数据库存储错误")
    return jsonify(errno=RET.OK,errmsg="操作成功")


@news_blue.route("/followed_user",methods=["post"])
@user_login_data
def followed_user():
    user=g.user
    if not user:
        return jsonify(errno=RET.SESSIONERR,errmsg="用户未登录")
    user_id=request.json.get("user_id",None)
    action=request.json.get("action",None)
    if not all([user_id,action]):
        return jsonify(errno=RET.PARAMERR,errmsg="参数不全")
    if action not in ("follow","unfollow"):
        return jsonify(errno=RET.PARAMERR,errmsg="参数错误")
    query_user=None
    try:
        query_user=User.query.get(user_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.DBERR,errmsg="数据库查询错误")
    if not query_user:
        return jsonify(RET.NODATA,errmsg="没有这个用户")
    if action=="follow":
        if query_user.followers.filter(User.id==user.id).count():
            return jsonify(errno=RET.DATAEXIST,errmsg="当前用户已存在")
        try:
            query_user.followers.append(user)
            db.session.commit()
        except Exception as e:
            current_app.logger.error(e)
            return jsonify(errno=RET.DBERR,errmsg="数据库添加错误")
    else:
        if query_user.followers.filter(User.id == user.id).count():
            try:
                query_user.followers.remove(user)
                db.session.commit()
            except Exception as e:
                current_app.logger.error(e)
                return jsonify(errno=RET.DBERR,errmsg="数据库删除错误")

    return jsonify(errno=RET.OK,errmsg="OK")





